CVE-2021-32862

Name: CVE-2021-32862
Creator: NVD / NIST
Published: 2022-08-18T19:15:14.337+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 1.10%

Last modified Jun 17, 2026

CVE-2021-32862 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. The GitHub Security Lab discovered sixteen ways to exploit a cross-site scripting vulnerability in nbconvert. When using nbconvert to generate an HTML version of a user-controllable notebook, it is possible to inject arbitrary HTML which may lead to cross-site scripting (XSS) vulnerabilities if these HTML notebooks are served by a web server (eg: nbviewer).. EPSS estimates a 1.10% chance of exploitation in the next 30 days.

Description

The GitHub Security Lab discovered sixteen ways to exploit a cross-site scripting vulnerability in nbconvert. When using nbconvert to generate an HTML version of a user-controllable notebook, it is possible to inject arbitrary HTML which may lead to cross-site scripting (XSS) vulnerabilities if these HTML notebooks are served by a web server (eg: nbviewer).

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

1.10%

61.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Jupyter	Nbconvert	<= 6.2.0
Debian	Debian Linux	10.0

References

https://github.com/jupyter/nbconvert/security/advisories/GHSA-9jmq-rx5f-8jwqExploit, Third Party Advisory
https://github.com/jupyter/nbviewer/security/advisories/GHSA-h274-fcvj-h2wmBroken Link
https://lists.debian.org/debian-lts-announce/2023/06/msg00003.htmlMailing List, Third Party Advisory
https://github.com/jupyter/nbconvert/security/advisories/GHSA-9jmq-rx5f-8jwqExploit, Third Party Advisory
https://github.com/jupyter/nbviewer/security/advisories/GHSA-h274-fcvj-h2wmBroken Link
https://lists.debian.org/debian-lts-announce/2023/06/msg00003.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/09/msg00004.html

Timeline

Published: Aug 18, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32862?

How severe is CVE-2021-32862?

CVE-2021-32862 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 1.10% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32862?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-32862?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST